According to the Estonian Police and Border Guard, Russia has moved the buoys from Narva River

https://www.politsei.ee/en/news/border-guard-of-the-russian-federation-removed-light-buoys-from-narva-river-11981

These buoys aren't there for the exclusive purpose of guiding fishing and shipping routes. They are also there to mark territorial rights to the river.

https://www.bloomberg.com/news/articles/2024-05-23/estonia-says-russia-removed-narva-river-buoys-marking-border

The EU (who knows they may be next in the Russian war expansion) has indeed responded by saying this is unacceptable

https://www.bbc.com/news/articles/c899844ypj2o

The question is why Estonia's NATO partners do not also comment on the removal of a member countries border demarcations. Such an action and the potential outcome can greatly affect them in the future as well.